RVHS_H1_Chemistry_P2_QP_2024

River Valley High School 8873/02/PRELIMS/24 2024 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 3 J CENTRE NUMBER S INDEX NUMBER H1 CHEMISTRY 8873/02 Paper 2 Structured Questions 9 September 2024 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your Centre number, index number, class and name on all the work that you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Section A Answer all the questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Question Number 1 2 3 4 5 6 7 8 Marks 9 16 7 5 9 14 20 20 significant figures units Total 80 This document consists of 25 printed pages and 3 blank pages.

2 River Valley High School 8873/02/PRELIMS/24 2024 Preliminary Examination 1 Ammonium sulfite can be prepared by the reaction of ammonia with sulfur dioxide in aqueous solution. 2NH3 + SO2 + H2O → (NH4)2SO3 (a) Draw a ‘dot-and-cross’ diagram to show the bonding in ammonium sulfite. [2] (b) State and explain the shape and bond angle in sulfite anion, SO32−. Shape: ……………………………………………………………………………….. Bond angle: …………………………………………………………………………. Explanation: ………………………………………………………………………..... ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… [3] (c) Explain how a dative bond is formed in NH4+. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… [1] (d) Explain, in terms of structure and bonding, if ammonium sulfite or ammonia has a higher boiling point. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… [3] [Total: 9]

3 River Valley High School 8873/02/PRELIMS/24 2024 Preliminary Examination [Turn over 2 Calcium chloride is used in temperate countries to prevent ice formation. (a) Using an equation, define the lattice energy of calcium chloride, CaCl2. ………………………………………………………………………………………... [1] (b) Use the data from the Data Booklet , explain how the magnitude of lattice energy of calcium chloride might compare to that of magnesium chloride. ………………………………………………………………………………………... ………………………………………………………………………………………... ………………………………………………………………………………………... ……………………………………………………………………………………....... [2] (c) Like magnesium chloride, a solution of calcium chloride is of pH 6.5. With the aid of a suitab